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-rw-r--r--libc/sysdeps/linux/sh/clone.S137
1 files changed, 137 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sh/clone.S b/libc/sysdeps/linux/sh/clone.S
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+++ b/libc/sysdeps/linux/sh/clone.S
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+/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+/* clone() is even more special than fork() as it mucks with stacks
+ and invokes a function in the right context after its all over. */
+
+#include <asm/unistd.h>
+#include <sysdep.h>
+#define _ERRNO_H 1
+#include <bits/errno.h>
+
+/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
+
+ .text
+.extern __syscall_error
+
+ENTRY(__clone)
+ /* sanity check arguments. */
+ tst r4, r4
+ bf/s 1f
+ tst r5, r5
+ bf/s 1f
+ mov.l .L1, r1
+#ifdef SHARED
+ mov.l r12, @-r15
+ sts.l pr, @-r15
+ mov.l .LG, r12
+ mova .LG, r0
+ add r0, r12
+ mova .L1, r0
+ add r0, r1
+ jsr @r1
+ mov #-EINVAL, r4
+ lds.l @r15+, pr
+ rts
+ mov.l @r15+, r12
+#else
+ jmp @r1
+ mov #-EINVAL, r4
+#endif
+ .align 2
+.L1:
+ .long PLTJMP(C_SYMBOL_NAME(__syscall_error))
+1:
+ /* insert the args onto the new stack */
+ mov.l r7, @-r5
+ /* save the function pointer as the 0th element */
+ mov.l r4, @-r5
+
+ /* do the system call */
+ mov r6, r4
+ mov #+__NR_clone, r3
+ trapa #0x12
+ mov r0, r1
+ mov #-12, r2
+ shad r2, r1
+ not r1, r1 // r1=0 means r0 = -1 to -4095
+ tst r1, r1 // i.e. error in linux
+ bf 2f
+ mov.l .L2, r1
+#ifdef SHARED
+ mov r0, r4
+ mov.l r12, @-r15
+ sts.l pr, @-r15
+ mov.l .LG, r12
+ mova .LG, r0
+ add r0, r12
+ mova .L2, r0
+ add r0, r1
+ jsr @r1
+ nop
+ lds.l @r15+, pr
+ rts
+ mov.l @r15+, r12
+#else
+ jmp @r1
+ mov r0, r4
+#endif
+ .align 2
+.L2:
+ .long PLTJMP(C_SYMBOL_NAME(__syscall_error))
+
+2:
+ tst r0, r0
+ bt 3f
+ rts
+ nop
+3:
+ /* thread starts */
+ mov.l @r15, r1
+ jsr @r1
+ mov.l @(4,r15), r4
+
+ /* we are done, passing the return value through r0 */
+ mov.l .L3, r1
+#ifdef SHARED
+ mov.l r12, @-r15
+ sts.l pr, @-r15
+ mov r0, r4
+ mova .LG, r0
+ mov.l .LG, r12
+ add r0, r12
+ mova .L3, r0
+ add r0, r1
+ jsr @r1
+ nop
+ lds.l @r15+, pr
+ rts
+ mov.l @r15+, r12
+#else
+ jmp @r1
+ mov r0, r4
+#endif
+ .align 2
+.LG:
+ .long _GLOBAL_OFFSET_TABLE_
+.L3:
+ .long PLTJMP(C_SYMBOL_NAME(_exit))
+ END(__clone)
+
+.globl clone;
+ clone = __clone